Transceiver channel selector

Abstract

The invention pertains to means for selecting transmit and receive frequencies in a multi-channel transceiver. The superheterodyne-type receiver includes a mixer and a crystal controlled oscillator to provide a variable frequency signal to the mixer, while the transmitter employs a separate crystal control oscillator to provide an appropriate signal to the modulator. Elements of a first bank of crystals are individually connected to the mixer oscillator by the action of two stepping switches which are alternately operable, through the action of a load switch, to forwardly bias a diode connected in series between one of the crystals and the oscillator. A mode switch grounds one side of either of the stepping switches to render it capable of biasing the diode into conduction. A second bank of crystals is selectively connected to the modulator oscillator by means of a third stepping switch which is mechanically ganged to one of the receive stepping switches. In one mode of operation, the receive stepping switch which is ganged into the transmit stepping switch is rendered operable by the mode switch so that a receive channel is automatically selected along with a particular transmit channel. In the alternate mode of operation, the receive switch, which is independently actuated, is connected to ground, thereby permitting the selection of a receive channel independently of the choice of a particular transmit channel.

What I claim is: 
     
       1. Channel selector means for a transceiver having a transmitter including a modulator and a receiver including a frequency mixer comprising: a. a first oscillator having an output connected to the mixer,   b. first frequency determining means for causing said oscillator to oscillate at one of a first plurality of selected frequencies,   c. said first frequency determining means including a first plurality of frequency resonant elements, .Iadd.there being a one-to-one correspondence between said frequency resonant elements and said frequencies, .Iaddend.   d. a second oscillator having an output connected to the modulator,   e. second frequency determining means for causing said oscillator to oscillate at one of a second plurality of selected frequencies,   f. said second frequency determining means including a second plurality of frequency resonant elements, .Iadd.there being a one-to-one correspondence between said last mentioned frequency resonant elements and said last mentioned frequencies, .Iaddend.   g. selectively operable first selection means for selecting a particular resonant element from said first plurality of frequency resonant elements and when operable .[.to associate.]. .Iadd.for associating .Iaddend.said particular resonant element selected thereby with said first oscillator to determine said one of a first plurality of selected frequencies,   h. selectively operable second selection means for selecting a particular resonant element from said first plurality of frequency resonant elements and.Iadd., .Iaddend.when operable.Iadd., .Iaddend..[.to associate.]. .Iadd.for associating .Iaddend.said particular resonant element selected thereby with said first oscillator to determine said one of a first plurality of selected frequencies.   i. third selection means for selecting a particular resonant element from said second plurality of frequency resonant elements and associating said particular resonant element selected thereby with said second oscillator to determine said one of a second plurality of selected frequencies,   j. a switch means for rendering said first selection means operable and said second selection means inoperable when in a first state and said second selection means operable and said first selection means inoperable when in a second state,   k. means connected to said second selection means for actuating said second selection means to select a particular resonant element from said first plurality of resonant elements, and   l. means connected to said first and third selection means for actuating said first and third selection means in unison to select a particular resonant element from said first and second plurality of frequency resonant elements, respectively.   
     
     
       2. Channel selector means as in claim 1 and wherein: a. said oscillators are crystal controlled, and   b. said frequency resonant elements are crystals.   
     
     
       3. Channel selector means as in claim 1 and wherein: a. said first and second selection means include switch means for connecting one of said first plurality of frequency resonant elements to said first oscillator.   
     
     
       4. Channel selector means as in claim 3 and wherein: a. said last mentioned switch means includes diodes and means for biasing said diodes.   
     
     
       5. Channel selector means as in claim 4 and wherein: a. said last mentioned switch means includes means for altering the bias on said diodes.   
     
     
       6. Channel selector means as in claim 5 and wherein: a. said means for altering the bias on said diodes includes a plurality of circuit legs connected at one end to one electrode of said diodes,   b. said first selection means and said second selection means include first contact means and second contact means, respectively, for selectively connecting the other ends of said circuit legs to said first mentioned switch means.   
     
     
       7. Channel selector means as in claim 6 and wherein: a. said first mentioned switch means includes means for grounding said other ends of said circuit legs either through said first contact means or said second contact means to render said first selection means or said second selection means, respectively, operable.   
     
     
       8. Channel selector means as in claim 7 and wherein: a. said third selection means includes switch means for connecting one of said second plurality of frequency resonant elements to said second oscillator, and   b. said first and last mentioned switch means are mechanically ganged.   
     
     
       9. Channel selector means as in claim 3 and wherein: a. said first, second and third selection means each includes stepping switch means.   
     
     
       10. Channel selector means as in claim 9 and wherein: a. said stepping switch means associated with said first and third selection means are mechanically ganged.   
     
     
       11. Channel selector means as in claim 3 and wherein: a. said last mentioned switch means is electronic in nature. .[.12. Channel selector means for a transceiver including a transmitter section and a receiver section comprising:   a. a first crystal controlled oscillator operatively associated with the receiver,   b. a first plurality of crystals,   c. first selection means for connecting one of said crystals to said oscillator operatively for frequency control,   d. a second crystal controlled oscillator associated with the transmitter,   e. a second plurality of crystals,   f. second selection means for connecting one of said last mentioned crystals to said second oscillator for frequency control,   g. said first selection means including first multiple position switch means and second multiple position switch means,   h. bi-state mode switch means for alternatively rendering one of said multiple position switch means operable to cause one of said first plurality of crystals to be connected to said first oscillator and render the other of said multiple position switch means inoperable to cause one of said first plurality of crystals to be connected to said first oscillator,   i. said second selection means including third multiple position switch means for causing one of said second plurality of crystals to be connected to said second oscillator, and   j. means for causing said third switch means and said first switch means to move to successive positions in unison..]. .[.13. Channel selection means for a multi-channel transceiver comprising:   a. first selection means for selecting a transmit channel from a first plurality of channels,   b. second selection means for selecting a receive channel from a second plurality of channels,   c. means for actuating one of said selection means to select a channel,   d. means for actuating the other of said selection means to select a channel, and   e. said means for actuating one of said selection means including selectively operable means for actuating said the other of said selection means when said one of said selection means is actuated..]..[.14. Channel selection means for a multi-channel transceiver comprising:   a. transmit selection means for selecting a transmit channel from a first plurality of channels,   b. receive selection means for selecting a receive channel from a second plurality of channels,   c. first means for actuating one of said selection means to select a channel,   d. selectively operable second means for actuating the other of said selection means to select a channel, and   e. said first means including selectively operable means for actuating said the other of said selection means to select a channel in unison with said one of said selection means and rendering said second means inoperable to actuate said the other of said selection means to select a channel..]. .Iadd.15. Channel selector means for a transceiver including a transmitter section and a receiver section, said selector means comprising:   a. a first crystal controlled oscillator operatively associated with said receiver section,   b. a first bank of crystals,   c. first multiple position switch means for operatively connecting any one of said crystals to said oscillator for frequency control of same,   d. second multiple position switch means for operatively connecting any one of said crystals to said oscillator for frequency control of same,   e. a second crystal controlled oscillator operatively associated with said transmitter section,   f. a second bank of crystals,   g. third multiple position switch means for operatively connecting any one of said second crystals to said second oscillator for frequency control of same,   h. said first and third switch means being interconnected to move to successive positions in unison, and   i. bi-state mode switch means for rendering said first switch means operable to connect any one of said first crystals to said first oscillator and said second switch means inoperable to connect any one of said first crystals to said first oscillator when in its first state, and when in its second state, for rendering said first switch means inoperable to connect any one of said first crystals to said first oscillator and said second switch means operable to connect any one of said first crystals to said first oscillator. .Iaddend. .Iadd.16. Channel selector means for a transceiver including a transmitter section and a receiver section, said selector means comprising:   a. a first crystal controlled oscillator operatively associated with said receiver section,   b. a first bank of crystals,   c. a second crystal control oscillator operatively associated with said transmitter section,   d. a second bank of crystals,   e. diode switch means for operatively associating said first bank of crystals with one of said oscillators to selectively control the frequency of same,   f. said diode switch means comprising: a plurality of normally reverse-biased diodes, each of said diodes completing a separate series circuit between individual said first crystals and said one of said oscillators,   said diodes forming an electrically open circuit when reverse-biased and an electrically closed circuit when forwardly biased,   first and second multiple position switch means for independently forwardly biasing any one of said diodes to thereby close the circuit between said last mentioned diode and said the other of said oscillators,   bi-state mode switch means for rendering said first switch means operable to forwardly bias any one of said diodes and said second switch means inoperable to forwardly bias any one of said diodes when in its first state, and, when in its second state, for rendering said first switch means inoperable to forwardly bias any one of said diodes and said second switch means operable to forwardly bias any one of said diodes,     g. third multiple position switch means for connecting any one of said second crystals to the other of said oscillators to selectively control the frequency of same,   h. said first and third switch means being interconnected to move to successive positions in unison. .Iaddend..Iadd.17. The channel selector means of claim 16 and wherein said bi-state switch means connects said first switch means to ground of potential when in its first state and connects said second switch means to ground potential when in its second state. .Iaddend.